Upper right sided discomfort, sometimes crampy, can be from increased blood flow to liver, stretching capsule of liver ("runner's stitch").
induces gastroesoph reflux
, can cause discomfort in mid-to right upper. Poor blood flow to gut when blood gets shunted to muscles, can cause cramps. Pregnant? Maybe poor blood flow to uterus
(not good), threatened miscaraige
see your doc; find out.